If memory serves, your ears should be less than 6.0 cm across in order to fit the R70x. Bought a set shortly after they came out and ran into the same issue. Clearly not the right cans for you if your nickname is
Dumbo.
In this case I always chalked it up to AT being a Japanese manufacturer with SE Asia being their main target market. But Beyerdynamic?!
It really isn't like pad dimensions should be news to anyone. A Sennheiser HD540 II or HD560 from 1991-ish will fit my ears just fine despite having circular earcups. (Humans are such a disappointing species - after all this time of headphones being made, they have yet to evolve circular ears.
)